Boiler



Aug 26, 1924;

. T. W. DAHLQUIST BOILER Filed March 5. 1921 Patented Aug. 26, 1924.

PATENT OFFICE- THEODORE W. DAHLQUIST, 0F DEDHAM, MASSACHUSETTS.

BOILER.

Application filed March 3, 1921. Serial No. 449,309.

To all whom it may concern:

Be it known that I, Trrnooonn W. DAHL- QUIST, a citizen of the United States, residing in Ded'ham, in the county of Norfolk and ,State of Massachusetts, have invented an Improvement in Boilers, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to a hot water boiler .of the character commonly used in connection with the water backs of kitchen ranges or like heaters. The invention has for its object to provide boilers ofthe character described withmeans for obtaining a direct flow of hot water from the heater or Water back when the hot water faucet or tap is opened, and for automatically effecting discharge of the hot water into the boiler when the said faucet or tap is closed.

To ,this end, the boiler has located in 'it a pipe which is connected at one end with the outlet pipe from the water back or other heater, and which has its opposite end communicating with the hot water outletpipe for the boiler, so as to discharge the hot water directly into said outlet pipe.

Provision is made for the 5110i; water passing through the hot water pipe within the boiler to be discharged into the boiler, when the direct flow of'hot waterto the faucet is interrupted by closing the latter.

The invention further has for its object to obtain substantially instantaneous hot water when the direct flow is established. Tothisend provision is made for insulating the pipe within the boiler from the cold Fig. 3, a modification of the insulated pipe to be referred to. I

Referring to Figs. 1 and 2, a represents a range boiler of known construction and such as is now commonly used in kitchens, in connection with the water back or front of the kitchen range or with a gas heater,

which heaters are represented by the coil ofpipes Z). 1

The boiler (b is provided with the usual cold water ,inlet pipe 10 extended through the head 12 of the boiler .to near the bottom thereof, and with the usual hot water outlet pipe 13 connected with the nipple or spud 14, covering the usual opening 15 in' the head of the boiler. The hot water outlet pipe 18 is provided at the sink, tub, bowl or the like with the usualhot water faucet or trap, not shown.

The heater 5 is connected by the pipe 16 with the bottomof the boiler a and its outlet pipe 17 connected with a spud or nipple 22 attached to the side of the boiler above the bottom thereof. The pipe 17 .constitutes the hot water inlet for the boiler. The parts thus far described are and may be such as are now commonly used in kitchens.

In accordance with the present invention the boiler a has located in ita conduit or pipe 20 (see Fig. 2.) connected at its lower end with an elbow 21 of suitable size and shape to be inserted into the spud or nipple 22 and rmake a water-tightfit therewith, and said pipe is made of sufficient length to on able it to discharge directly into the outlet pipe 13, and in the present instance, the pipe 20 has its upper end extended into the spud or nipple 14, whereby a. direct connection is obtained between the outlet pipe 17 for the heater 5 and the outlet pipe 13 for the boiler, so that hot water from the heater Y) may pass directly to the outlet pipe 13 for the boiler without admixing with the water in the boiler when the tap or faucet in the hot water outlet pipe 13 isopened.

Provision is made for enabling the hot water from the heater to be automatically diverted into the boiler when the faucet or tap in the hot water outlet pipe 13 is closed.

To this end, the pipe .20 may be provided at its upper end with a plurality of rela boilers are being constructed.

tively small ports or openings 24, which are located in the pipe near the upper end thereof, or the pipe 20 may be made smaller than the bore of the spud or nipple 14: to leave a space between the spud and the end of the pipe extended therein of sufficient size to permit the hot water from the pipe 20 to flow back into the boiler. The area of the port openings 24 in the pipe 20 or the space between the pipe 20 and the spud 14 is such as not to materially interfere with the flow of hot water from the heater directly to the outlet pipe 13 when the faucet or tap in the latter is opened.

This direct flow of hot water from the heater enables hot water to be obtained at the faucet or tap in the outlet pipe in much quicker time than when the hot water is drawn from the boiler with the tap or faucet opened.

. When the tap or faucet is closed, it will be observed that circulation of the hot water is automatically established from the boiler to the heater, and back to the boiler.

Provision may and preferably will be made for still further reducing the time required to obtain hot water at the tap in the outlet pipe 13, and to this end, the pipe 20 for the greater part ofits length is protected from contact with the cooler water in the boiler by an insulator, which may be a covering of suitable material on the pipe 20 or as herein shown, may be an air space 26 surrounding the pipe 20 and formed by a sleeve 27 of larger diameter than the pipe and closed at its end to the admission therein of water from the boiler.

The sleeve 27 may be closed at its lower end by the elbow 21 over which it is tightly fitted, and at itsupper end by a cap or washer 28 fitted tightly thereon and through which the pipe 20 is extended.

In Fig. 2, the pipe 20 and sleeve 27 are represented as connected directly with the elbow 21, which is fitted tight into the spud 22 located within the boiler, but when the spud 22 is located outside the boiler as shown in Fig. 3, the pipe 20 and sleeve 27 may be connected with a nipple 30, which in turn is connected with the elbow 21. The insulated pipe 20 with the elbow 21 attached thereto may be inserted into the boiler through the opening 15 in the head 12 and the elbow 21 inserted into the spud. 22 without disturbing the boiler, which enables the invention to be embodied in boilers now in use in households without taking the latter down or removing eitherhead, whereas in new boilers, the invention may be incorporated while the By tests conducted with range boilers embodying this invention, one of which was provided with the insulated pipe shown herein, and the other with the pipe 20 alone and-in contact with the water in the boiler,

and starting with the boilers full of cold water, and with a fire applied to the heater 1), the following results were obtained.

Hot water at the tap was obtained in less than two minutes from the boiler provided with the insulated pipe 20, and in four minutes from the boiler having the non-insulated pipe 20. It will thus be seen that with a boiler equipped with an insulated pipe 20, practically instantaneous hot water may be obtained at the tap, starting with the boiler full of cold water.

From the above description and by reference to the drawing, it will be seen that the boiler is provided within it with a conduit for hot water from the heater directly into the outlet pipe for the boiler, substantially independent of the boiler when the said outlet pipe is opened at its tap or faucet,

. which conduit automatically diverts the hot R waterinto the boiler and establishes water circulation therethrough when said outletpipe is closed at its tap.

By this arrangement substantially instantaneous hot'water may be obtained from the boiler, thereby dispensing with auxiliary heaters extraneous to the boiler for this purpose.

Claims. v

1. A boiler provided with an opening in the top thereof and with a nipple secured to the outside of the boiler and covering said opening and adapted for connection to the usual hot water discharge pipe from the boiler, an opening in the side of the boiler and a nipple secured to the boiler and covering such opening and adapted for connection to the usual hot water inlet pipe leading from the heater, and a pipe detach ably secured within the boiler, having its lower end inserted into said last-named nip" pie to form a substantially water-tight joint therewith, and having its upper end extended into said first-named nipple and 11o forming a substantially close fit joint therewith, and to thereby directly connect the hot water inlet and outlet pipes leading to and from the boiler and having a small opening therein near the top of the boiler for the purpose specified, said pipe being of a size capable of insertion into the boiler through the first-named opening in the. top of the boiler.

2. A boiler provided with an opening in the top thereof and with a nipple secured to the outside of the boiler and covering said opening and adapted for connection to the usual hot water discharge pipe from the boiler, an opening in the side of the boiler and a nipple secured. to the boiler and covering such opening and adapted for connection to the usual hot water inlet pipe leading from the heater, and an'insulated pipe detachably secured within the boiler,

having its lower end inserted into said lastnamed nipple to form a substantially watertight joint therewith, and having its upper end extended into said first-named nipple to form a substantially close fit joint therewith, and to thereby directly connect the hot water inlet and outlet pipes leading to and from the boiler and having a small opening therein near the top of the boiler for the purpose specified, said insulated pipe being of a size capable of insertion into the boiler through the first-named opening in the top of the boiler.

In testimony whereof, I have signed my name to this specification.

THEODORE W. DAHLQUIST. 

